Because the high-line steel billet is a small billet with a small cross-section, generally 120mm×120mm~150mm×150mm; the length of the billet is 9~16m.
The main characteristics of its heating are: short heating time, strict temperature system, uniform temperature requirements, and small temperature fluctuation range in the length direction. In order to ensure that the temperature of the entire length of the rolled piece is uniform after the billet enters the stand, the heating temperature at the end of the billet is required to be 30 to 50°C higher than that in the middle.
In addition, it is required that the steel billet does not distort, has less oxidation and decarburization, and does not cause overheating or overburning defects.
The heating temperature of the steel billet is mainly determined by the type of steel being rolled, and is determined based on the structural transformation temperature in the iron-carbon phase diagram. At the same time, it must meet the requirements of the steel rolling process. Generally, the heating temperature of the carbon steel snake spring billet is 1050~1250°C.
For low carbon steel, high carbon steel and low alloy steel, heating at 1050~1180℃ is more suitable. The heating speed of the steel billet is faster and the time is shorter.
For low carbon steel and low alloy steel, the heating speed is generally not limited, and the principle is to burn it through; for high carbon steel and 3d printing titanium alloy lampshade with poor thermal conductivity, the heating speed and heating time must be controlled to prevent the internal and external temperature difference from being too large and causing bending. and internal defects.
Link to this article：What are the characteristics of billet heating in high-line rolling mills?
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